Antibacterial composites based on halloysite with silver nanoparticles and polyoxometalates

Q3 Materials Science JCIS open Pub Date : 2023-10-30 DOI:10.1016/j.jciso.2023.100098

Adeliya R. Sayfutdinova , Kirill A. Cherednichenko , Alexey A. Bezdomnikov , Ubirajara Pereira Rodrigues-Filho , Vladimir V. Vinokurov , Berik Tuleubayev , Denis Rimashevskiy , Dmitry S. Kopitsyn , Andrei A. Novikov

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Abstract

The spread of bacterial infections aggravated by the development of microbial resistance to antibiotics requires the creation of protective antibacterial materials. Nanomaterials with biocides can provide antibacterial and antibiofilm properties against Gram-positive and Gram-negative bacteria. In this work, we synthesized nanocomposites with silver nanoparticles and different polyoxometalates of Keggin-structure (phosphomolybdic, phosphotungstic, and tungstosilicic acids) on eco-friendly nanoclay called halloysite. We found that the nanocomposite containing silver nanoparticles and phosphomolybdic acid deposited on the halloysite possesses the best antibacterial performance of all the obtained composites, having a minimal inhibitory concentration of 0.5 g/L against S. aureus, 0.25 g/L against P. aeruginosa and A. baumannii. This composite reduces the viability of formed biofilms at a concentration of 2.5 g/L.

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高岭土-纳米银-多金属氧酸酯抗菌复合材料

微生物对抗生素的耐药性的发展加剧了细菌感染的传播，这需要创造保护性抗菌材料。含有杀菌剂的纳米材料可以对革兰氏阳性和革兰氏阴性细菌提供抗菌和抗生物膜特性。在这项工作中，我们在生态友好型纳米粘土高岭土上合成了银纳米粒子和不同的凯金结构多金属氧酸盐(磷钼酸、磷钨酸和钨硅酸)的纳米复合材料。我们发现，在所有复合材料中，沉积在高岭土上的含银纳米粒子和磷钼酸的纳米复合材料具有最佳的抗菌性能，对金黄色葡萄球菌的最小抑制浓度为0.5 g/L，对铜绿假单胞菌和鲍曼假单胞菌的最小抑制浓度为0.25 g/L。当浓度为2.5 g/L时，这种复合物会降低形成的生物膜的活力。

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